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Web3.js JavaScript Library

Intro diagram


Web3.js is a set of libraries that allow developers to interact with Ethereum nodes using HTTP, IPC, or WebSocket protocols with JavaScript. Moonbeam has an Ethereum-like API available that is fully compatible with Ethereum-style JSON RPC invocations. Therefore, developers can leverage this compatibility and use the web3.js library to interact with a Moonbeam node as if they were doing so on Ethereum.

Setup Web3.js with Moonbeam

To get started with the web3.js library, we first need to install it using the following command:

npm install web3

Once done, the simplest setup to start using the library and its methods is the following:

const Web3 = require('web3');

//Create web3 instance
const web3 = new Web3('RPC_URL');

Depending on which network you want to connect to, you can set the RPC_URL to the following values:

  • Moonbeam development node:
  • Moonbase Alpha TestNet:
  • Moonriver:


If you are interested in a more detailed step-by-step guide, go to our specific tutorials about using web3.js on Moonbeam to send a transaction or deploy a contract.